Joseph duvall and john wintbrbottom



NVPEI'ERS. PHOTO-LITHOGRAPHER. WASHINGTON. D C.

To all whom it lmay concern:

thereof', reference being 'of this description, in which- -ont of the'way of logs `the whole is hereinafter l r anita swag @anni aan,

JOSEPH DUVALIJ AND JOHN WINTERBOTTOM, YOF KEWAUNEE, WISCONSIN.

`Lette/rcPatent No. 103,032, dated May 17, 1870.

IMPROVEMENT INHEAD-BLOCKS FOR SAWMILLS.

The Schedule referred `to inthese Letters Patent making part of the` ame -Be it' known that we, JOSEPH DUvALL'and J oHN `WIIITERBOTZIOM, `of Kewauuee, in the county of Keivaunee and State of Wisconsin, have invented a Headblock for Circular' Sa'wmills; and we "do hereby de clare that the following is a full and exactrdescription had to the accompanying drawings and letters marked thereon making apart Figure l is a perspective representation of `a head A block for circular sawmills, with my improvement at-v tached.

r Figure '2 a plan view of apart of the block, showing the knee in position as it is when turned down.

Figure 3 an inverted broken-view of the head-block, showing the rack and pinion for moving the knee.Y

Figure 4 a vertical section, online xx, iig. 2, ofthe knee-carriage,showing how the knee is hinged to it. lhe present invention consist-s in so forming the head-block for circular sawmills by cutting away a portion of one side thereof so that the hinged knee.

may fold down at the side ol' said block, so as to be when being rolled thereon, as

fully described.

H H represents the vertical sides of' the ordinary head-block now iu use in circular 'sawmillsand -I the carriage to which the knee -A is attached, said .carriage being provided with a rack, Z, fig. 3, on its under side; is moved back and forth in the block H H by means of a pinion, X, in the-usual manner.

The knee A` has heretofore been rigidly attached to the carriage I, and, as ajconseqnence, logs could only be pnt onto the headLblock at its end, S, nearest to the circular saw, involving a loss of time, and bring the vlogs over the lumber-way.

We remedy this objection by hnging the knee A Vtoits carriage I by means of projecting ears R S, a bolt, U-T, and nut O, as shown at figs. 2 and ,4, so that the knee can be turned down, as shown in iig. 2.

a sulicient portion of one of the sides' H of the head1l block being cut away to `admit of the knees having` r that position, as shown at figs. 1 and 2.

In other respects the knee is quite similar yto the stationary knee, its base, B, being provided with grooves to run on the guides or flanges O D, attached i to the top part of the head-block. v

A` knee constructed and arranged on our plan will hold or move-a log inthe same manner as the `fixed knee, while, at the saine lime, it can, when runl back to the proper place,'be turne downY below the top of the head-block, so that lumber or logs can be put -on or o" at either side of' the main carriage. i

We are aware that folding knees have been before used, but not as herein shown orscol'nbined. i

Y Having thus described our invention,

We claim- A vsawmill 'head-block,constructed as shown and` JOSEPH DUVALLI JOHN WINTERBOTTOM.

described.

' Witnesses:

R. S. WING, DE WAYNE STEBBINs. 

